CN110362923B - Three-dimensional monitoring coverage rate method based on three-dimensional visual field analysis, monitoring installation method and monitoring system - Google Patents
Three-dimensional monitoring coverage rate method based on three-dimensional visual field analysis, monitoring installation method and monitoring system Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/20—Design optimisation, verification or simulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
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- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
- G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
Abstract
The invention discloses a three-dimensional monitoring coverage rate method based on three-dimensional visual domain analysis, which relates to the technical field of monitoring and comprises the following contents: calculating the volume of each monitoring point covering the monitoring range; adding the monitoring range volume of each monitoring point in the same monitoring area, and subtracting the monitoring range volume overlapped by adjacent monitoring points to obtain the effective monitoring volume of the monitoring area; and dividing the effective monitoring volume by the total monitoring area volume of the monitoring area to obtain the effective monitoring coverage rate. The invention also provides a monitoring installation method and a monitoring system. The invention can ensure that the monitoring coverage rate is real and accurate, the monitoring equipment is reasonably installed, and the monitoring system can monitor without dead angles.
Description
Technical Field
The invention relates to the technical field of monitoring, in particular to a three-dimensional monitoring coverage rate method based on three-dimensional visual domain analysis, a monitoring installation method and a monitoring system.
Background
Monitoring coverage is a key indicator for evaluating monitoring ability of a monitoring system. The current monitoring coverage rate generally refers to the ratio of the effective coverage area of video monitoring to the total area of the whole monitoring area, and is an important index for evaluating whether the stationing of a camera in a video monitoring system is scientific or not and an important mark for judging whether the whole monitoring area is effectively controlled or not.
The visual field analysis means that the range which can be covered by the sight line of an observer is analyzed by taking the observation point as an origin and taking a given radius as the farthest sight distance. The existing visual field analysis can calculate the area range which can be monitored by a monitoring camera when a monitoring point is taken as an observation point, and the area range is taken as a monitoring effective area.
The current monitoring coverage rate is the ratio of the effective coverage area of video monitoring to the total area of the whole monitoring area, the current video monitoring coverage rate is only considered from the area coverage, the fact that the monitoring area is three-dimensional is completely ignored, the monitoring coverage rate obtained by area calculation is not accurate, the arrangement of each monitoring point in the monitoring system installed according to the monitoring coverage rate is unreasonable, and the monitoring effect of the whole monitoring system is influenced.
Disclosure of Invention
The invention provides a three-dimensional monitoring coverage rate method based on three-dimensional visual domain analysis, which aims to solve the problem that the monitoring coverage rate calculated by the existing monitoring coverage rate method is inaccurate.
In order to solve the above problems, the following scheme is provided:
the three-dimensional monitoring coverage rate method based on the three-dimensional visual domain analysis in the scheme comprises the following contents:
calculating the volume of each monitoring point covering the monitoring range; adding the monitoring range volume of each monitoring point in the same monitoring area, and subtracting the monitoring range volume overlapped by adjacent monitoring points to obtain the effective monitoring volume of the monitoring area; and dividing the effective monitoring volume by the total monitoring area volume of the monitoring area to obtain the effective monitoring coverage rate.
The noun explains:
monitoring points: the position where the monitoring device is installed, or as it is understood, the position of the observer, with which the monitoring can be facilitated, is referred to as the observation point.
The scheme has the advantages that:
compared with the conventional method that the coverage rate is calculated by using the surface area, the method and the device calculate the effective monitoring coverage rate by calculating the volume of the monitoring area and the effective monitoring volume, so that the coverage rate and the monitoring effect are more visual in correspondence, and the dead-angle-free monitoring can be really realized.
Compared with the existing visual field analysis, the three-dimensional visual field analysis is usually only focused on area analysis, and the three-dimensional visual field analysis of the scheme further obtains and emphasizes the sight coverage space of the monitoring point on the basis of the visual field analysis, so that the coverage rate obtained by calculation is closer to the real monitoring environment coverage rate, and the obtained data is more accurate and real.
In addition, according to the method for calculating the effective monitoring coverage rate, the monitoring effect in the monitoring area can be reasonably judged through the effective monitoring coverage rate.
Further, dividing at least one key area in one monitoring area, taking the volume of each key area as the monomer volume of the key area, adding the monitoring area volumes of all monitoring points in each key area, and subtracting the overlapping monitoring area volume of adjacent monitoring points in the key area to obtain the total monitoring area volume of all monitoring points in the key area as the monomer monitoring volume of the key area; and dividing the key area monomer monitoring volume by the key area monomer volume to obtain the key area monitoring monomer coverage rate.
By calculating the coverage rate of the monitoring units in the key area, the monitoring effect in one key area can be judged, and whether the monitoring equipment in the monitoring system is reasonably installed in the key area is further judged. And the coverage rate of the key area monitoring monomers is calculated through the key area monomer monitoring volume and the key area monomer volume, so that the real monitoring condition of the monitoring point can be approached more, and the calculated coverage rate is more accurate.
Further, key area monomer volumes of all key areas in one monitoring area are added, then the volumes which are overlapped with each other are subtracted to obtain a total volume of the key areas, all key area monomer monitoring volumes are added, then the volumes which are overlapped with each other are subtracted to obtain an effective monitoring volume of the key areas, and the effective monitoring volume of the key areas is divided by the total volume of the key areas to obtain the monitoring coverage rate of the key areas.
The monitoring coverage rate of the key area is calculated according to the effective monitoring volume of the key area and the total volume of the key area, the monitoring conditions of all key areas in the area can be reasonably judged according to the same monitoring area, and then whether the monitoring equipment of the monitoring system is reasonably installed in the key area is judged. And the calculation of the total volume and the effective monitoring volume of the key area can play a good reference role in the installation of the monitoring equipment for the distinguishing division and the subsequent grading in the monitoring area.
Further, in the same monitoring area, the coverage rate of the key area monitoring monomer is greater than or equal to the monitoring coverage rate of the key area, and the monitoring coverage rate of the key area is greater than or equal to the effective monitoring coverage rate.
In a monitoring system satisfying such monitoring coverage, its monitoring effect and installation of monitoring equipment are considered reasonable.
The invention also provides a monitoring and installing method based on the three-dimensional visual field analysis, which comprises the following steps:
calculating effective monitoring coverage, key area monitoring coverage and key area monitoring monomer coverage according to the three-dimensional monitoring coverage method based on the three-dimensional visual field analysis;
selecting a three-dimensional area needing to be monitored from a demand environment as a monitoring area; dividing a monitoring area into a plurality of selection areas; determining at least one selected area as a key area;
setting an effective monitoring coverage preset value, a key area monitoring coverage preset value and a key area monitoring monomer coverage preset value;
according to the total number of the monitoring devices, the number of the monitoring devices with different numbers is respectively installed in each selected area, and meanwhile, the effective monitoring coverage rate reaches the preset value of the effective monitoring coverage rate, the monitoring coverage rate of a key area reaches the preset value of the monitoring coverage rate of the key area, and the monitoring coverage rate of a monitoring monomer of the key area reaches the preset value of the monitoring monomer of the key area.
The scheme has the advantages that:
the monitoring effect of the whole monitoring system and the installation of monitoring equipment are reasonably preset by setting an effective monitoring coverage preset value, a key area monitoring coverage preset value and a key area monitoring single body coverage preset value, and meanwhile, a key area is selected from a selected area, so that the whole monitoring area can be subjected to key monitoring in a hierarchical manner, and no dead angle is monitored on the premise of using less monitoring equipment as far as possible. Various coverage rates in the scheme are calculated through monitoring the volume, so that the coverage rates can directly correspond to the real monitoring condition, and monitoring equipment installed by taking the coverage rates as the judgment standard can really realize dead-angle-free monitoring.
And further, completing the installation of the monitoring equipment in each selected area in the monitoring area according to the installation sequence and installation distribution with the maximum monitoring coverage rate or the priority of the key area.
When the monitoring equipment in each selected area is installed, the monitoring equipment can be installed in the mode of maximum coverage rate priority or key area priority.
The maximum monitoring coverage rate comprises the maximum sum of the effective monitoring coverage rate, the key area monitoring coverage rate and the key area monitoring monomer coverage rate, the maximum effective monitoring coverage rate or the maximum key area monitoring coverage rate.
The monitoring coverage is the largest, and may be selected according to specific requirements, for example: the sum of the three coverage rates is the maximum, which shows that the stronger the monitoring coverage is, the better the monitoring effect is, and the installation of the monitoring equipment is most reasonable. The effective monitoring coverage rate is the largest, and the overall monitoring effect of the whole monitoring area is emphasized. The monitoring coverage rate of the key area is the maximum, and the monitoring effect on the key area is emphasized. The three modes are respectively emphasized, and a user can select the modes according to actual requirements.
Further, the key areas are divided into key areas with different important levels, and the coverage rate of the key area monitoring monomers corresponding to the key areas of each level is different.
The key areas are further divided according to the important levels, so that the coverage rate of the monitoring equipment in the key areas of each level is different, the distribution quantity of the monitoring equipment in each key area is different, and all the monitoring equipment can be effectively distributed and installed most reasonably.
Further, when the volume of the effective monitoring range or the single monitoring volume of the key area is calculated, the monitoring overlapping volume of each monitoring device is reduced by adjusting the installation angle of the single monitoring device.
The installation angle of the monitoring equipment is adjusted to reduce the monitoring overlapping volume, so that the installation quantity of the monitoring equipment can be saved as much as possible in the same monitoring area.
The invention also provides a monitoring system based on the three-dimensional visual field analysis, and the monitoring equipment is installed in each selected area by adopting the monitoring installation method.
The scheme has the advantages that:
the monitoring system constructed by the method can realize no dead angle in monitoring under the condition of using the least monitoring equipment.
Further, during monitoring, monitoring equipment in the selected area can be monitored in a reverse mode through the selected area.
Therefore, the place where abnormal invasion occurs can be locked in time during monitoring, and the monitoring system can react in time after finding the situation.
Drawings
Fig. 1 is an exemplary diagram of the total demand environment in embodiment 1.
Fig. 2 is a monitoring area in example 1.
Fig. 3 is a view of the cone of view and the monitoring range of the monitoring device monitor 1.
FIG. 4 is a simplified schematic diagram of the monitoring range of monitor1 of FIG. 3.
FIG. 5 is a schematic view of the intersection of several rays emanating from the origin of the viewing vertebral body with an obstruction.
FIG. 6 is a schematic diagram of the intersection area of monitoring device monitor1 and monitoring device monitor 2.
Fig. 7 is a schematic diagram of key regions in example 1.
Fig. 8 is a schematic diagram of monitor devices monitor1 and monitor2 for monitoring the area by selecting the area s _ select in a reverse-deduction manner in embodiment 1.
Fig. 9 is an illustration of a process after two monitoring devices are installed in embodiment 1.
FIG. 10 is a schematic diagram of FIG. 9 compensating for the area of monitor3 that is not covered by monitor 4.
Fig. 11 is a schematic diagram of an environment to be deployed and a preset installation site in embodiment 1.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the system comprises a three-dimensional area S, a monitoring area total volume V0, an effective monitoring range volume V1, an effective monitoring Coverage ratio Coverage1, a key area total volume V2, a key area effective monitoring volume V3, a key area monitoring Coverage ratio Coverage2, a key area monomer volume V4, a key area monomer monitoring volume V5, a key area monitoring monomer Coverage ratio Coverage3 and a selected area S _ select.
Example 1:
in this embodiment, the three-dimensional monitoring coverage rate method based on three-dimensional visual domain analysis includes the following steps:
F0. the method comprises the steps of determining and receiving three-dimensional geographic information (mainly comprising a terrain model, a building model and the like, wherein the terrain model refers to a formula set which is formed in a monitored area through parameters such as land length, width, gradient and the like and is used for displaying the three-dimensional shape of the land in the monitored area, and the building model refers to a formula set which is formed in the monitored area through parameters such as length, width, height and the like and is used for displaying various building shapes and contours erected on the land in the monitored area), and superposing the terrain model and the building model to form a three-dimensional area s to be monitored, namely the monitored area.
Marking a plurality of key areas in a three-dimensional area s to form a key-area set, and obtaining the monitoring range volume of a single monitoring point through three-dimensional coordinate position, the maximum monitoring azimuth angle, the pitch angle and the maximum monitoring distance of the monitoring point (such as monitoring equipment such as a monitoring camera, and the latitude, the altitude of the monitoring point can be detected through the existing detection device arranged on the monitoring equipment), and three-dimensional visual domain analysis. The three-dimensional visual field analysis in this embodiment may adopt a double-increment method, a reference plane method, a triangle intersection method, a line-of-sight and edge intersection method, or a projection coverage detection algorithm, etc.
F1. The total volume of the monitored area v0 is calculated. (i.e. the total volume v0 of the three-dimensional region s) the calculation method in this embodiment is the cecum platform built-in method (i.e. the total volume of the region minus the volume of the object in the region is calculated).
Accumulating the volume of the monitoring range of each monitoring point, simultaneously subtracting the volume of the cross Coverage of the adjacent monitoring points, namely subtracting the volume of the overlapping area to obtain the volume v1 of the effective monitoring range formed by all the monitoring points, and calculating to obtain the effective monitoring Coverage rate 1= v1/v0 x 100%;
F2. and calculating the accumulation sum of each key area in the key-areas set and removing the overlapped volume to obtain the total volume v2 of the key area. And accumulating the monitoring range volumes of all the monitoring points arranged in the key region, subtracting the overlapped volume to obtain the effective monitoring volume v3 of the key region monitored by the monitoring points in all the key regions, and calculating to obtain the monitoring Coverage rate 2 = v3/v2 × 100% of the key region.
F3. Calculating the Coverage rate Coverage of the key area monomer 3= v5/v4 by 100% through the key area monomer volume v4 of the key area and the key area monomer monitoring volume v5 covered by the monitoring equipment in the key area;
the method is used for judging whether each monitoring device in the monitoring system is reasonably installed and whether the monitoring effect reaches the preset effect or not by setting the effective monitoring coverage preset value, the key area monitoring coverage preset value and the key area monitoring monomer coverage preset value.
When the effective monitoring Coverage ratio Coverage1 is greater than or equal to the effective monitoring Coverage ratio preset value, meanwhile, the key area monitoring Coverage ratio Coverage2 is greater than or equal to the key area monitoring Coverage ratio preset value, and meanwhile, the key area monitoring monomer Coverage ratio Coverage3 of several key areas with the most important points is greater than or equal to the key area monitoring monomer Coverage ratio preset value, it is considered that the installation of the monitoring equipment in the monitoring area is reasonable.
For the key area monitoring monomer Coverage ratio Coverage ratios coverages 3 which need to be considered are less than or equal to the total number of key areas in the monitoring area, the key areas can be classified according to important programs according to different factors such as the distribution positions of the key areas, different key area monitoring monomer Coverage ratio preset values can be set for the key areas of different grades, and only when the key area monitoring monomer Coverage ratios coverages 3 of the key areas of each corresponding grade reach the corresponding preset values, all the key areas reach the expected monitoring effect, at this time, all the monitoring devices of the monitoring system can be reasonably installed, and the monitoring effect is good.
In this embodiment, the preset value of the effective monitoring coverage is 85%, the preset value of the monitoring coverage of the key area is 97%, and the preset value of the monitoring coverage of the key area is 100%, as shown in fig. 11, two key areas, namely a key area S1 and a key area S2, are defined in the present embodiment, and the key area S2 is taken as the key area and the key area S1 is taken as the general key area according to the comprehensive consideration of the relevant factors such as the distribution of buildings, population density, property value, and the like in the two key areas. When the effective monitoring Coverage1 is greater than or equal to 85%, and at the same time, the critical area monitoring Coverage2 is greater than or equal to 97%, and at the same time, the critical area monitoring monomer Coverage3 of the critical area S2 is greater than or equal to 100%, we consider that the installation of the monitoring equipment in the monitoring area is reasonable.
According to the calculation of the coverage rate, the following method is adopted when the monitoring equipment is installed:
first, specific values of Coverage1, Coverage2, and Coverage3 are determined.
F4. And thinning the whole monitoring area, and dividing the monitoring area into a plurality of selected areas according to specific positions. When monitoring equipment in a certain selected area s _ select is installed, reversely deducing the installation number and the installation position of the monitoring equipment covering the area through the effective monitoring Coverage ratio Coverage1 of the whole monitoring area, the key area monitoring Coverage ratios Coverage2 of all key areas and the key area monitoring monomer Coverage ratio Coverage3 of the selected area s _ select;
F5. according to the algorithm function1, monitoring equipment can be automatically deployed through the site-mode place _ models so as to achieve the purpose of maximizing the monitoring range as much as possible through a preset monitoring site set { can-place-places }, the area s to be monitored and the total number of monitoring equipment Numb 1.
Wherein, the algorithm function1 refers to an allocation method for allocating the number of monitoring devices to each selected area installation after determining the total number of monitoring devices. In the function1 in this embodiment, a three-dimensional region S is first planarized in two dimensions as required, and divided into N small regions, and then specific angles of each monitoring point in the small regions are sequentially traversed according to the site selection mode place _ models to calculate the maximum coverage rate of each monitoring point, and then each traversal result is summed according to the total number of monitoring devices to obtain the maximum value.
The site _ models refer to priorities when the monitoring equipment is installed, and include but are not limited to key area priority and coverage area priority; the key area priority means that the monitoring equipment is installed according to the importance degree grade of the key area, and the higher the importance degree grade is, the more the installation is prioritized; the coverage area is preferred to mean that the monitoring equipment is installed according to the coverage rate, and the monitoring equipment is installed in the selected area with the larger coverage rate.
F6. Similarly, the corresponding coverage rate can be calculated systematically directly and manually according to the position of the installed monitoring equipment without presetting the installation position.
As shown in fig. 1, the high-precision three-dimensional geographic information of the demand environment in F0 is high-precision three-dimensional information including the overall environment range of the demand monitoring environment, and the overall environment range including objects (blocking lens objects, such as house walls, terrains, trees, etc.).
As shown in fig. 2, the three-dimensional region s to be monitored extracted from the demand environment is a region that the monitoring system actually needs to monitor (the area of the demand environment does not need to be monitored in some places, such as a region facing the sky, a lake, etc.), that is, a monitored region.
The key-areas set { key-areas } marked in the three-dimensional area s to be monitored is the set of the key-areas most to be monitored in s.
As shown in fig. 3 and 4, the maximum monitoring azimuth angle of a monitoring device is the angle from north to south (clockwise is positive), and the maximum monitoring distance is the maximum vertical ray length when the ray of the monitoring device is perpendicular to the monitored object, i.e. the longest effective monitoring distance.
The monitoring range volume of a single monitoring device refers to the volume of a part where the volume which can be shot by the single monitoring device and the volume of the three-dimensional area s to be monitored intersect and coincide.
The overlapping area volume is removed in F1 because the monitoring ranges of adjacent monitoring devices will have overlapping portions, avoiding the need to repeatedly calculate the coverage volume of the monitoring devices.
A monitoring site set can-placed-places is preset in F5, and a set of a plurality of location points where monitoring equipment can be placed is designated manually.
Total number of monitoring devices Numb1, which is the minimum number of monitoring devices purchased to meet the coverage requirement, generally Numb1 is less than can-placed-places.
The monitoring equipment in each selected area is installed by adopting the coverage rate calculation method, so that the monitoring system formed by the method can realize dead-angle-free monitoring.
The specific implementation process is as follows:
the embodiment is based on a Cesium three-dimensional platform, and the invention does not limit the implementation method and the platform of the main claim.
And calculating the monitoring coverage rate.
Firstly, three-dimensional geographic information of a demand environment is obtained.
As shown in the gray cube part of fig. 1, a three-dimensional image of a certain cell is obtained by oblique photography (i.e., non-planar photography), and high-precision three-dimensional information of an overall environment range in the area, including objects (such as house walls, terrain, trees, etc.) in the overall environment range is obtained by the GIS technology. And establishing a three-dimensional model of the cell through a Cesium three-dimensional platform, wherein the gray cube part is the total demand environment.
Then, the demand monitoring environment is obtained from the demand environment, namely, the monitoring area is determined.
In the total demand environment, a three-dimensional area s of the environment to be monitored, i.e., an overall monitoring area, is obtained. The frame of fig. 1 is the total demand environment, and the areas between the buildings, including the ground surface installations such as buildings, are the monitoring areas. The monitoring area in this embodiment is different from the monitoring area in the prior art, and is not only the monitoring of the surface area of the ground surface of the cell, but also the monitoring of the three-dimensional space of the whole cell.
Third, the total monitored area volume v0 of the demand environment is calculated.
And subtracting the volume of fixed buildings such as buildings in the region by the volume of the three-dimensional region s of the demand monitoring environment to obtain the total volume v0 of the monitoring region of the demand environment.
Fourthly, a visual cone is drawn for a single monitoring device, and the monitoring range volume of the single monitoring device monitor1 is obtained by using three-dimensional visual domain analysis.
And calculating the monitoring area which can be monitored by each monitoring device according to all the monitoring devices in the monitoring area. For example, one of the monitoring devices Monitor1 is selected, parameters of the monitoring device Monitor1, namely, the coordinate position Monitor1_ position (three-dimensional coordinates) and the maximum monitoring azimuth (Monitor1_ pitch _ angle _ max, Monitor1_ pitch _ angle _ min), the pitch (Monitor1_ head _ angle _ max, Monitor1_ head _ angle _ min) and the maximum monitoring distance (Monitor1_ radius) of the monitoring device Monitor are obtained, and according to these parameters, the monitoring range (view pyramid) of the monitoring device of Monitor1 is drawn, and as shown in fig. 3, the view pyramid formed by the boundaries of the line of sight emitted from the monitoring device is the view pyramid, namely, the monitoring range of the Monitor.
As shown in fig. 4, when calculating the view frustum, the simplified view frustum is used, theta is the direction angle, α is the pitch angle, the z-axis direction is the north-south direction, and ob is the maximum monitoring distance.
Then, the effective monitored volume v _ monitor1 of monitor1 is found.
Obtaining an available volume v1_1 according to the vertical average distance between the intersection point of the ray with the three-dimensional model and the monitor1_ position, wherein the intersection point is the ray with the monitor1_ position as the starting point, and the monitor1_3Dtile _ average _ length;
the available volume v1_2 is obtained according to the vertical average distance between the intersection point of the ray with the requirement monitoring environment s and the monitor1_ position, wherein the intersection point is the ray with the monitor1_ position as the starting point, and the monitor1_ s _ average _ length;
subtracting v1_2 from v1_1 to obtain the effective monitored volume v _ monitor1 of monitor 1.
The volume is determined by the vertical mean distance of the ray intersections. When there are enough ray intersections, the volume of the incomplete view centrum with the current intersection plane can be calculated only by requiring the vertical average distance of the intersection plane, namely, the area of the bottom surface is multiplied by the height (the average vertical distance of the intersection point) multiplied by one third.
As shown in fig. 5, the ray emitted from the monitoring device monitor intersects with the ground or a ground building to form a plurality of intersection points, such as J1, J2, J3, J4, J5, J6, J7, a.... JN, through each intersection point, a vertical distance to the monitoring device monitor can be made, the length of the vertical distance is calculated by using the pythagorean theorem, and each intersection point has a vertical distance (for example, through the intersection point J5, the vertical distance to the monitoring device monitor is DJ 5), and there are N vertical distances in total, and then the average of the N vertical distances is obtained, namely (h1+ h2+ … + hn)/N, so as to obtain an average vertical distance h _ average, and then the pyramid volume is calculated by using the positive height h _ average (the height of the pyramid perpendicular to the pyramid through the pyramid fixed point) and related parameters; finally, the volume is obtained by h _ average bottom area/3.
Fifth, the monitoring coverage of a single monitoring device (monitor) is calculated.
Dividing v _ monitor1 by v0 times hundred percent results in a monitoring Coverage rate monitor1_ Coverage of the monitoring device monitor1 in the three-dimensional area s of the demand monitoring environment.
Sixth, the intersection (overlap) region of multiple monitoring devices is found, and the overlap region volume is found.
As shown in fig. 6, according to the method in fig. 5, the volume of the superimposed area of the monitoring devices can be obtained, and similarly, the monitoring coverage of a plurality of monitoring devices can be obtained. In this embodiment, the volume of the overlapping area is obtained by obtaining a plurality of intersection points of two monitor devices monitor1 for monitor2 view cone rays, wherein if each ray intersects, there are two intersection points in and out certainly, the initial intersection point is used as a starting point, the latter intersection point is used as an end point (in fig. 5, the intersection volume is obtained through monitor 1), and the length of a connecting line between the starting point and the end point on the single ray is calculated. The intersection volume can also be obtained by intersection analysis through a Cesium platform built-in space analysis method.
And adding the volumes of the single monitoring ranges of all the monitoring devices in the monitoring area, and subtracting the volume of the overlapping area to obtain an effective monitoring range volume V1 (V1/V0) × 100% = effective monitoring Coverage ratio Coverage1, wherein the effective monitoring range volume V1 can be monitored by all the monitoring devices together. Through effective monitoring Coverage ratio Coverage1, whether the installation of the monitoring equipment in the monitoring area is reasonable or not can be judged, and whether the monitoring effect of the monitoring system constructed by the monitoring equipment is good or not can be judged. When the Coverage1 is more than or equal to 85%, the monitoring effect is good primarily, and then parameters such as Coverage2, Coverage3 and the like are compared.
Seventh, coverage calculation of critical areas.
As shown in fig. 7, the orange part is the key area, and similarly, the monitoring Coverage rate of the key area is determined to be 1_ keyarea1_ Coverage.
Eighth, a key area is selected in the monitored area, and a key area Coverage ratio Coverage2 is calculated.
One or more dispersed areas are selected from the monitoring area to form a key-area set, and each dispersed area is called a key-area monomer.
The monomer volume V4 of each key region is calculated, and then the monomer volumes of all key regions are added to obtain the total key region volume V2.
And calculating the monitoring range of all the monitoring devices in each key area monomer to obtain a key area monomer monitoring volume V5 (V5 is equal to the sum of the monitoring range view cone volumes of all the monitoring devices in each key area monomer and the subtraction of the superposition volume). For each critical zone monomer, critical zone monitoring monomer Coverage3= (V5/V4) × 100%. When Coverage3 is equal to or greater than 100%, it is considered that the installation of the monitoring device in the monitoring area is reasonable.
For the whole critical area formed by all the critical area monomers in the monitoring area, the critical area total volume V2 is equal to the critical area monomer volume V4, and the overlapping area is subtracted after the addition. Similarly, the critical zone effective monitoring volume V3 for the monitoring coverage of the monitoring device in the whole critical zone is equal to the sum of the individual monitoring volumes V5 of each critical zone and the subtraction of the overlapping area. When the monitoring Coverage ratio Coverage2 of the key area is greater than or equal to 97%, the monitoring effect of the monitoring system in the monitoring area is considered to be good, and each monitoring device is reasonably installed.
The following method is adopted when a monitoring system is constructed and monitoring equipment is installed:
first, as shown in fig. 8, the whole monitoring area is divided into a plurality of selection areas, and the monitoring devices of each selection area are calculated and installed one by one. And reversely deducing the installation position of the monitoring equipment covering the selected area s _ select by using the three-dimensional visual field analysis according to the selected area s _ select.
After the selection area s _ select is determined, the maximum monitoring distance of the monitoring equipment is used as a buffer area, the virtual monitoring equipment is sequentially and randomly arranged from one end of the selection area to obtain a set { monitor in s _ select _ buffer } of all the monitoring equipment in the buffer, then three-dimensional visual field analysis is carried out on each monitoring equipment in the set to draw a visual cone of the monitoring range of each virtual monitoring equipment, if the ray intersection point exists between the monitoring equipment and the selection area s _ select model, the monitoring range covered by the monitoring equipment is considered to be overlapped with the selection area s _ select, and the monitoring equipment covers the selection area. As shown in FIG. 8, monitor devices covering the current area are inferred from the selected area s _ select, namely monitor1 and monitor 2.
Conversely, when the monitoring system constructed by the installation method is used for monitoring, the monitoring equipment covering the area can be deduced reversely by determining the three-dimensional area (a certain selected area) where the external invasion occurs.
Second, the installation of the monitoring device to be installed is guided according to the installed (or simulated installation) monitoring device.
As shown in fig. 9, two monitoring devices are used for streets inside the rectangular frame, when coverage is as large as possible, the installed monitoring device is monitor3, and the uninstalled monitoring device is monitor4, the position and the installation angle (the direction angle and the pitch angle) of the monitor4 can be adjusted, and a better installation scheme can be obtained by calculating the coverage rate, as shown in fig. 10.
Third, the monitoring device is deployed semi-automatically.
After the three-dimensional area s of the required monitoring area is determined, 3 monitoring devices are preset, and 6 installation sites are preset.
And a preset monitoring address point set { p1, p2, p3, p4, p5, p6}, a three-dimensional area s to be monitored and the total number of monitoring equipment 3.
As shown in fig. 11, the three-dimensional area s to be monitored is divided into 4 parts.
In this embodiment, place _ models are selected as the key zone priority (as shown in fig. 11, there are S1 and S2 for the key zone), and then 3 monitoring devices are preferentially deployed in the key zones S1 and S2. The result point will certainly be a combination of p1, p2, p4, p 5.
Compared with the prior art, when the view image control equipment is arranged in the demand environments such as living communities, shopping mall floors and the like, the problem that no dead angle exists at key points can not be solved due to shelters such as terrain, ornaments, house wall surfaces and trees.
Example 2
Compared with embodiment 1, the present embodiment gives priority to the maximum monitoring coverage rate, and the maximum monitoring coverage rate in the present embodiment refers to the maximum coverage rate of the monitoring single body in the key area. Key region monitoring monomer Coverage ratio Coverage3 ≧ Key region monitoring Coverage ratio Coverage2 ≧ effective monitoring Coverage ratio Coverage 1. When the monitoring equipment is installed, the numerical requirements of Coverage3, Coverage2 and Coverage1 are required to be met in sequence. Therefore, on the premise of limiting the number of monitoring devices, the monitoring range is as large as possible, and no dead angle monitoring is achieved.
The algorithm function1 is a method for arranging monitoring equipment according to a certain method, for example, a monitoring area is divided into a plurality of area sets { S2S }, if the area has a preset monitoring selection point, a security monitoring device is used, and if the security monitoring device is used, the next area is jumped to; the site _ model in the addressing mode determines the priority level of the preset monitoring selection point, and the site _ model in this embodiment is a coverage rate priority mode, and the priority level of the preset monitoring selection point with the largest coverage rate is the highest.
When the monitoring device is specifically installed, as shown in fig. 11, the three-dimensional area s to be monitored is divided into 4 parts. In this embodiment, place _ models are selected as a coverage priority mode, and specific angles of each monitoring point are sequentially traversed to calculate the maximum coverage of the specific monitoring point, and then the maximum coverage is combined to realize the optimal deployment set of 3 monitoring devices.
Example 3
Compared with embodiment 1, the present embodiment gives priority to the maximum monitoring coverage, and the maximum monitoring coverage in the present embodiment means the maximum effective monitoring coverage. The effective monitoring Coverage ratio Coverage1 is more than or equal to the key area monitoring monomer Coverage ratio, and the effective monitoring Coverage ratio Coverage1 is more than or equal to the key area monitoring Coverage ratio 2.
Example 4
Compared with embodiment 1, this embodiment gives priority to the maximum monitoring coverage rate, and the maximum monitoring coverage rate in this embodiment refers to the maximum monitoring coverage rate in the key area. The key area monitoring Coverage ratio Coverage2 is more than or equal to the key area monitoring monomer Coverage ratio Coverage3, and the key area monitoring Coverage ratio Coverage2 is more than or equal to the effective monitoring Coverage ratio 1.
Example 5
Compared with embodiment 1, in this embodiment, the maximum monitoring coverage is considered preferentially, and the maximum monitoring coverage in this embodiment refers to the maximum sum of the effective monitoring coverage, the critical area monitoring coverage and the critical area monitoring monomer coverage. Namely, key area monitoring Coverage2+ key area monitoring cell Coverage3+ effective monitoring Coverage1= max.
The descriptions in the above embodiments and the like can be used to explain the contents of the claims.
Claims (6)
1. The three-dimensional monitoring coverage rate method based on three-dimensional visual field analysis is characterized by comprising the following steps: the method comprises the following steps:
calculating the volume of each monitoring point covering the monitoring range; adding the monitoring range volume of each monitoring point in the same monitoring area, and subtracting the monitoring range volume overlapped by adjacent monitoring points to obtain the effective monitoring volume of the monitoring area; dividing the effective monitoring volume by the total volume of the monitoring area to obtain an effective monitoring coverage rate;
dividing at least one key area in one monitoring area, taking the volume of each key area as the monomer volume of the key area, adding the monitoring area volumes of all monitoring points in each key area, and subtracting the overlapping monitoring area volume of adjacent monitoring points in the key area to obtain the total monitoring area volume of all monitoring points in the key area as the monomer monitoring volume of the key area; dividing the key area monomer monitoring volume by the key area monomer volume to obtain a key area monitoring monomer coverage rate; the total volume of the monitored area is the total volume of the building; adding the key area monomer volumes of all key areas in a monitoring area, subtracting the volumes which are overlapped with each other to obtain a key area total volume, adding the key area monomer monitoring volumes, subtracting the volumes which are overlapped with each other to obtain a key area effective monitoring volume, and dividing the key area effective monitoring volume by the key area total volume to obtain a key area monitoring coverage rate;
in the same monitoring area, the coverage rate of the key area monitoring monomer is greater than or equal to the monitoring coverage rate of the key area, and the monitoring coverage rate of the key area is greater than or equal to the effective monitoring coverage rate.
2. The monitoring installation method based on the three-dimensional visual field analysis is characterized by comprising the following steps: calculating effective monitoring coverage, key area monitoring coverage and key area monitoring monomer coverage according to the three-dimensional monitoring coverage method based on the three-dimensional visual field analysis of claim 1;
selecting a three-dimensional area needing to be monitored from a demand environment as a monitoring area; dividing a monitoring area into a plurality of selection areas; determining at least one selected area as a key area;
setting an effective monitoring coverage preset value, a key area monitoring coverage preset value and a key area monitoring monomer coverage preset value;
respectively installing different numbers of monitoring equipment into each selected area according to the total number of the monitoring equipment, and simultaneously enabling the effective monitoring coverage rate to reach an effective monitoring coverage rate preset value, the key area monitoring coverage rate to reach a key area monitoring coverage rate preset value and the key area monitoring monomer coverage rate to reach a key area monitoring monomer coverage rate preset value;
completing the installation of the monitoring equipment in each selected area in the monitoring area according to the installation sequence with the maximum monitoring coverage rate or the priority of the key area and the installation distribution;
the maximum monitoring coverage rate comprises the maximum sum of the effective monitoring coverage rate, the key area monitoring coverage rate and the key area monitoring monomer coverage rate, the maximum effective monitoring coverage rate or the maximum key area monitoring coverage rate.
3. The monitoring installation method based on three-dimensional visual field analysis according to claim 2, characterized in that: and dividing the key areas into key areas with different important levels, wherein the key areas corresponding to the key areas of each level have different monitoring monomer coverage rates.
4. The monitoring installation method based on three-dimensional visual field analysis according to claim 2, characterized in that: when the effective monitoring volume or the single monitoring volume of the key area is calculated, the monitoring overlapping volume of each monitoring device is reduced by adjusting the installation angle of the single monitoring device.
5. Monitoring system based on three-dimensional visual field analysis, its characterized in that: the method for installing the monitoring device based on the three-dimensional visual field analysis comprises the steps of installing a plurality of monitoring devices in each selected area by adopting the method for installing the monitoring device based on the three-dimensional visual field analysis according to claim 2.
6. The monitoring system based on three-dimensional visual domain analysis according to claim 5, wherein: and during monitoring, reversely deducing and monitoring the monitoring equipment in the selected area by determining the selected area.
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| CN116309884B (en) * | 2023-05-24 | 2023-08-01 | 成都陆拓信息技术有限公司 | Three-dimensional space region video blind area identification method |
| CN117376531B (en) * | 2023-10-17 | 2024-03-19 | 杭州众诚咨询监理有限公司 | Monitoring equipment coverage overlapping judging method, system and storage medium |
| CN117576333A (en) * | 2024-01-15 | 2024-02-20 | 苍穹数码技术股份有限公司 | Method and device for determining visible region, electronic equipment and storage medium |
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